Metaknowledge: “Meta-knowledge is a fundamental conceptual instrument in such research and scientific domains as, knowledge engineering, knowledge management, and others dealing with study and operations on knowledge, seen as a unified object/entities, abstracted from local conceptualizations and terminologies. Examples of the first-level individual meta-knowledge are methods of planning, modeling, tagging, learning and every modification of a domain knowledge. The procedures, methodologies and strategies of teaching, coordination of e-learning courses are individual meta-meta-knowledge of an intelligent entity (a person, organization or society). Put simpler, metaknowledge may be linked to knowledge you need but you don’t yet possess: it is a cluster of definitions and methods aiming to guide you in gathering the pertinent knowledge with regard to your activity” (from Wikipedia: Metaknowledge).

Metalanguage: Metalanguage “can refer to any terminology or language used to discuss language itself: a written grammar, for example, or a discussion about language use” (from Wikipedia: Metalanguage).

Metalogic: “While logic is the study of the manner in which logical system can be used to decide the correctness of arguments, metalogic studies the properties of the logical systems themselves. According to Geoffrey Hunter, while logic concerns itself with the “truths of logic,” metalogic concerns itself with the theory of “sentences used to express truths of logic.” (from Wikipedia: Metalogic.)

Metarealism: Metaphysical or metaphoric realism, a direction in Russian poetry and fiction born in 1970s and 1980s. “Metarealism seeks to depict the reality which exist beyond that psychological subjective perspective. Metarealism proposes not only to communicate further than the pictorial aspect of the perception of other dimension of reality, but also the essence of those dimensions and their relation to us as human beings” (from Wikipedia: Metarealism).